From: Joona Kiiski <joona.kiiski@gmail.com>
Date: Fri, 12 Feb 2010 08:53:03 +0000 (+0200)
Subject: Search negative SEE moves in qsearch in PV
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=7c61b8ad2a81438cdfd6c6e6c66f86a4760c0b8d;hp=a093f33154cdd7b1d82e41f67fc673d3a22545bc

Search negative SEE moves in qsearch in PV

After 2704 games on slow single core
mod - orig: 1381 - 1323

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index 3e74ddc2..8d941f92 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1695,6 +1695,7 @@ namespace {
 
       // Don't search moves with negative SEE values
       if (   (!isCheck || evasionPrunable)
+          && !pvNode
           &&  move != ttMove
           && !move_is_promotion(move)
           &&  pos.see_sign(move) < 0)